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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e3992822e2d2cac29a5deaf4f807d5b77085284ca1daab4fe8c5d3026f3a05' 
  AND token = 'jVFqB0A0KY3thZX89bs6+ailbJo/Vvi5AD0e0qukTMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}